Optional: you may add sub categories before you start adding pictures. Example: I add this "test" category, using the "Add Sub Category" link I could add 2 more categories for "BS 350 restoration" and then one for "BS 175 restoration", and add them under the parent category "tes" then add my pictures to those 2 sub-categories (BS 350 restoration, BS 175 restoration) and not the main category (test).